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No one will get this one!!!

Posted on 2000-04-18
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Last Modified: 2010-03-05

             
3 Write a program to solve the following problem.  Use an array to model the
  safety deposit box vault.  Initialize the boxes as described below.

              ===========================================
                         SAFETY DEPOSIT BOXES
              ===========================================

  There has been a run at the local savings and loan.  One thousand depositors
  have lined up in a very long vault with 1000 _CLOSED_ safety deposit boxes.
  One by one the depositors run through the vault.  The first depositor opens
  every box.  The second depositor goes to every second box and closes it.  
  The third depositor goes to every third box and changes it (if open, closes
  it; if closed, open it).  In a similiar manner, every fourth, fifth, sixth,
  ... depositor changes every fourth, fifth, sixth, ... box.  After all 1000
  depositors have passed through the vault, which boxes are left open?

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Question by:myoreorex
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Accepted Solution

by:
maneshr earned 200 total points
ID: 2727961
try this..........

the results are really amazing!! all the boxes that are open are squares of numbers!!
==================amazin.pl

#!/usr/local/bin/perl

##  initalize all the boxes
##  0=closed, 1=open
foreach (0..999){
  $box[$_]=0;
}

foreach $user (1..1000){  ##  For every investor..
  print $user,"\n";
  foreach($[ .. $#box){
    $ctr=$_+1;
    if (($ctr % $user) == 0){
    print "\t",$ctr,"\n";
      if ($box[$_]){
        $box[$_]=0;
      }else{
        $box[$_]=1;
      }
    }
  }
}

print "box #'s that are open \n";
foreach($[ .. $#box){
  if ($box[$_]){
    $box_no=$_+1;
    print $box_no,"\n";
  }
}
0
 

Author Comment

by:myoreorex
ID: 2727978
Thanks...I forgot about the foreach..........

Michelle
0
 

Author Comment

by:myoreorex
ID: 2727989
Thanks...I forgot about the foreach!!!


michelle
0

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